How do I get Yahoo Mail to recognize SM as a modern browser? After I login it tells me I need to upgrade to Firefox (or some other browser) and limits me to 'classic mail'. My user agent is: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:49.0) Gecko/20100101 Firefox/49.0 SeaMonkey/2.46

Yahoo just started complaining about this, and I've been on 2.46 for over a month. I had advanced mail before this started happening!

Justinh wrote:How do I get Yahoo Mail to recognize SM as a modern browser? After I login it tells me I need to upgrade to Firefox (or some other browser) and limits me to 'classic mail'. My user agent is: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:49.0) Gecko/20100101 Firefox/49.0 SeaMonkey/2.46

Type about:config in the Address Bar and press Enter to display the list of preferences.

I know there are libraries out there that tell you what browser someone's using based on their user agent string - for example "Firefox" or "IE" or "SeaMonkey". My guess is that a lot of web developers use one of these libraries and just check whether the name is "Firefox" - because either they have never heard of SeaMonkey or don't want to spend time testing their site on it. (The same is true of Vivaldi et al.)

It would theoretically be possible to tell if someone is using SeaMonkey in other ways (e.g. the presence of the window.sidebar.addPanel function), but I don't imagine this would be very common.

Justinh wrote:How do I get Yahoo Mail to recognize SM as a modern browser? After I login it tells me I need to upgrade to Firefox (or some other browser) and limits me to 'classic mail'. My user agent is: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:49.0) Gecko/20100101 Firefox/49.0 SeaMonkey/2.46

Type about:config in the Address Bar and press Enter to display the list of preferences.

You seem to have updated the user agent string only to version 49 of Firefox. As the current version of that browser is 56 you may need to tweak the user agent string to that higher value to get Yahoo to leave you alone.

Their web designers must be really low quality. Not only do they block browsers based on user agent rather than features, but even when you click "Continue using Classic Mail" it still redirects you to the error page. That's just sloppy web coding.

I am still getting the same error using both EIT and poppy10 suggestions. Am I not inputting this correctly? When it asks for a name to the string I just put in the same string and then the actual string. Should I name it something?